Bones (8/7c, Fox): Seems you can't keep a good entomologist down for long. The long-running crime drama returns from a four-month break, picking up with Hodgins (T.J. Thyne) eight weeks into his rehabilitation from the explosion that left him paralyzed, now trying to navigate crime scenes in a wheelchair against doctors' orders and wife Angela's (Michaela Conlin) worried wishes. "I need to be here. It's who I am," says the dedicated "Squint" as his colleagues balance their desire to protect their friend against his need to be useful. An intriguing conflict for a procedural in its 11th season.

Mom (9/8c, CBS): A new man entered Bonnie's (Allison Janney) life last week—Adam (William Fichtner), a "Mr. Right" who first appeared as a talkative wrong number on her cell phone—and their first date ended prematurely when he balked before introducing himself, possibly insecure because he's in a wheelchair, and unaware what a train wreck Bonnie can be. This week the relationship moves forward, although Christy (Anna Faris) soon begins to doubt he's the good guy he appears to be.

Orphan Black (10/9c, BBC America): Even when the mythology becomes forbiddingly dense and murky, this twisty sci-fi thriller remains grounded in Tatiana Maslany's protean genius as a variety of embattled clones. So it goes as the fourth season opens by taking us back before the show's beginning, tracking policewoman Beth—whose death led Sarah on her path to self-awareness—and opening up new mysteries to the clones' origins.

Inside Thursday TV: In back-to-back episodes of ABC's Grey's Anatomy (8/7c), Miranda (Chandra Wilson) learns just how tough it is to be Chief when husband Ben (Jason George) faces disciplinary action after his latest reckless surgical stunt. … The most gung-ho reality competition in recent memory, Fox's American Grit (9/9c) puts four teams under the guidance of elite military veterans (including former Dancing With the Stars contestant Noah Galloway) to tackle extreme physical challenges. Talk back to your mentor and you'll also face the wrath of series host, WWE star John Cena. … It's a busy schedule for political junkies. While Democratic presidential contenders Hillary Clinton and Bernie Sanders face off on CNN (8/7c) in yet another debate, this time in Brooklyn in anticipation of next Tuesday's New York primary, MSNBC holds separate town halls in New York locations for Republican hopefuls John Kasich (7/6c) and Ted Cruz (8/7c). Later, Cruz makes his first appearance on NBC's Tonight Show With Jimmy Fallon (11:35/10:35c), while Kasich shows up on NBC's Late Night With Seth Meyers (12:35/11:35c).

Sign up for Newsletter

Keep up to date with this show by signing up for email updates, from breaking news to interviews and much more…